18-letter words containing r, c, o, l
- pollen mother cell — one of the mother cells that produce four microspores by meiosis.
- polychromatophilic — having an affinity for more than one kind of stain, especially for acid, neutral, and basic stains, as polychromatophilic erythroblasts characteristic of pernicious anemia.
- polystyrene cement — a purpose-made adhesive for fixing rigid polystyrene
- polyvinyl chloride — a white, water-insoluble, thermoplastic resin, derived by the polymerization of vinyl chloride: used chiefly for thin coatings, insulation, and pipings.
- population control — a policy of attempting to limit the growth in numbers of a population, esp in poor or densely populated parts of the world, by programmes of contraception or sterilization
- portal circulation — blood flow in a portal system.
- portion-controlled — being a standardized portion of food: The restaurant uses frozen, portion-controlled entrées.
- positively charged — having a positive charge
- postal storage car — a railroad car for transporting unsorted mail.
- potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
- potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
- pour cold water on — If someone pours cold water on a plan or idea, they criticize it so much that people lose their enthusiasm for it.
- precedence lossage — /pre's*-dens los'*j/ A misunderstanding of operator precedence resulting in unintended grouping of arithmetic or logical operators when coding an expression. Used especially of mistakes in C code due to the nonintuitively low precedence of "&", "|", "^", "<<" and ">>". For example, the following C expression, intended to test the least significant bit of x, x & 1 == 0 is parsed as x & (1 == 0) which is always zero (false). Some lazy programmers ignore precedence and parenthesise everything. Lisp fans enjoy pointing out that this can't happen in *their* favourite language, which eschews precedence entirely, requiring one to use explicit parentheses everywhere.
- preparatory school — a private or parochial secondary school, especially one boarding its students and providing a college-preparatory education.
- principal diagonal — a diagonal line or plane.
- process scheduling — multitasking
- product life cycle — the four stages (introduction, growth, maturity, and decline) into one of which the sales of a product fall during its market life
- production control — the planning and supervision of manufacturing activities to ensure that goods will be produced on time at the lowest possible cost.
- proprietary colony — any of certain colonies, as Maryland and Pennsylvania, that were granted to an individual or group by the British crown and that were granted full rights of self-government.
- protective colloid — a lyophilic colloid added to a lyophobic sol to lessen its sensitivity to the precipitating effect of an electrolyte.
- protocol converter — (networking) A device or program to translate between different protocols which serve similar functions (e.g. TCP and TP4). Some call this a "gateway", though others use that term for other kinds of internetworking device.
- protocol data unit — (PDU) A packet of data passed across a network. The term implies a specific layer of the OSI seven layer model and a specific protocol.
- provably difficult — The set or property of problems for which it can be proven that no polynomial-time algorithm exists, only exponential-time algorithms.
- provascular tissue — procambium.
- provincial council — (formerly) a council administering any of the New Zealand provinces
- pseudotuberculosis — an acute, sometimes fatal disease of rodents, birds, and other animals, including humans, caused by the bacterium Yersinia (Pasteurella) pseudotuberculosis, and characterized by the formation of nodules resembling those that result from tuberculosis.
- psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
- psychopharmacology — the branch of pharmacology dealing with the psychological effects of drugs.
- public corporation — a corporation, owned and operated by a government, established for the administration of certain public programs.
- pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
- pyromucic aldehyde — furfural.
- pyrosulphuric acid — a fuming liquid acid made by adding sulphur trioxide to concentrated sulphuric acid. Formula: H2S2O7
- quality controller — a person responsible for checking that the goods or services produced by an organization are of an acceptable standard
- quality of service — (communications, networking) (QoS) The performance properties of a network service, possibly including throughput, transit delay, priority. Some protocols allow packets or streams to include QoS requirements.
- rabbit-foot clover — a plant, Trifolium arvense, having trifoliate leaves with narrow leaflets and fuzzy, cylindrical, grayish-pink flower heads.
- racial segregation — social policy: separation of races
- racially motivated — motivated by (the hate or prejudice of) someone's race
- radical expression — an expression in which radical signs appear.
- real-estate office — the place where a real-estate agent works
- real-time computer — a computer that can process data or information almost immediately
- reflection density — a measure of the extent to which a surface reflects light or other electromagnetic radiation, equal to the logarithm to base ten of the reciprocal of the reflectance
- reggio di calabria — a seaport in S Italy, on the Strait of Messina: almost totally destroyed by an earthquake 1908.
- reinforced plastic — plastic with fibrous matter, such as carbon fibre, embedded in it to confer additional strength
- reprocessing plant — a plant where materials are treated in order to make them reusable
- residential school — (in Canada) a boarding school maintained by the Canadian government for Indian and Inuit children from sparsely populated settlements
- resurrection plant — a desert plant, Selaginella lepidophylla, occurring from Texas to South America, having stems that curl inward when dry.
- reverse psychology — (in nontechnical use) a method of getting another person to do what one wants by pretending not to want it or to want something else or something more.
- revolution counter — a device for counting or recording the number of revolutions made by a rotating shaft, as of a motor or engine.
- rhodes scholarship — one of a number of scholarships at Oxford University, established by the will of Cecil Rhodes, for selected students (Rhodes scholars) from the British Commonwealth and the United States.
- rolling resistance — The rolling resistance of a wheel or ball is its resistance to movement caused by friction between it and the surface it is rolling on.